Question: WHICH IS THE RAILROAD WITH THE MAXIMUM GRADIENT
Paraphrase: What is the RR with the highest gradient?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q22667 . ?ent wdt:P2595 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: Driving Creek Railway, Rečkovská lesní dráha, León-Gijón railway line, Natal Railway Company